- Print CalculatorPeriodic Table - Incorrect Incorrect sapling learning A young
ID: 1459052 • Letter: #
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- Print CalculatorPeriodic Table - Incorrect Incorrect sapling learning A young work crew is trying to quickly finish some touch-up painting to complete a job. Rather than setting up a secure work area, they decide to try a shortcut. Worker A will hold the far end of a 8.00 m work plank which weighs 1.10 x 102 N and is secured with a hinge on the opposite end. Worker B will stand on the plank 4.99 m from worker A. Worker B also brings up his paint can, mc 3.60 kg, which he places 0.430 m from where he is standing on the plank (between the two workers). Worker A unfortunately needs to supply 496 N of force to hold the end of the plank. How much does worker B weigh? The acceleration due to gravity is g 9.81 m/s2 Number IF,= | | 1095.55 There is additional feedback available! View this feedback by clicking on the bottom divider bar. Click on the divider bar again to hide the additional feedback IncorrectExplanation / Answer
in equilibrium net torque = 0
w1 (plank) = 110 N
x1 = L/2 = 4 m
wB = ?
rB = 8-4.99 = 3.01 m
wc = mc*g
rc = rB+0.43 = 3.44 m
F = 496 N
rF = L = 8 m
net torque = 0
w1*x1 + Wb*rb + wc*rc = F*rF
(110*4)+(Wb*3.01)+(3.6*9.81*3.44)=(496*8)
Wb = 1131.73 N <<------answer
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